Levi walker



(No Model.)

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` UNITED STATES PATENT OFFICE.`l

LEVI W'ALKER, OF DELHI, ONTARIO, CANADA.

PLow-coLTER.

SPEGIFICATIGN forming part of Letters Patent No. 410,055, dated August2'7, 1889.

Application filed April 20, 1889. Serial No. 308,027. (No model.)

To all whom it may concern:

Be it known that I, LEVI WALKER, of Delhi, in the Province of Ontario,Dominion of Canada, have invented certain new and useful Improvements inPlow-Colters; and I do hereby declare that the following is afull,clear, and exact description of the same, reference being had to theaccompanying drawings, forming a part hereof.

My invention, which will be hereinafter fully set forth and claimed,relates to plowcolters.

The object of my invention is a reversible and adjustable colter thatshall reduce the draft, make an effectual cut, and be easily and cheaplymanufactured and kept in repair.

Figure l is an elevation of Ymy improved colter. Fig. 2 shows myimproved colter in a different adjustment. Fig. 3 is a vertical sectionon line m, Fig. l. Fig. 4 is a transverse section on line y y, Fig. l;and Fig. 5 shows a modification of my improved colter.

The arrows show the direction in which the colter is intended to work.

A is a detachable coltershank, consisting of a straight flat bar havingits lower end reduced in thickness from a square shoulder a at a rightangle, or nearly so, to the shank, and forming a recess a for thereception of the colter-blade iiush with the fiat side of the shank.Said recess is provided with two bolt-holes c for the reception of boltswith sunk heads.

B is the colter-blade, made of thin steel, and of the shape, or as nearas may be, as shown, one edge b being convex, commencing at the top witha moderately quick curve on a line approximately vertical, thengradually sloping rearwardly, and iiatt-ening out to almost a straightline as it approaches and finally passes the horizontal with a quickerturn, terminating at the point b', while the other edge b is concaveWhere it adjoins the point and convex at the top, the latter or thatpart connecting the two cutting-edges approximately a portion of acircle, but having two straight lines or edges b and 11 joining.

each other at a very obtuse angle of such magnitude as to form ahorizontal to the desired corresponding position of the blade and in thetop of the blade, through which the bolts C pass and are secured by nutsc. One of these bolt-holes B is placed about opposite the obtuse pointAformed by the straight edges 29 19, and the two lower ones are placed sothat a line drawn through the center of either of them and the upper oneB is at a right angle with opposite straight edges bill O1, b/'l When itis desired to plow sod, clover-roots, and the like, the colter is used,as shown in Fig. l, with its convex edge foremost, giving a draw cut,while for plowing stubble and the like, Where particular cuttingproperties are not requisite, the blade is reversed and used in theopposite position, (shown in Fig. 2,) in which position the edge Z9 ispreserved and kept sharp. Being detachable, the blade B is readily andcheaply replaced when worn out, the shank practically lasting as long asthe plow-frame. j

Anon-reversible draw-cut colter combining shank and blade in one andanswering the same purpose as that shown in Fig. 1 as regards cuttingquality is shown in Fig. 4, which practically represents the convexedges b of Figs. l and 2. i

I claim as my inventionl. In a plow-colter, the. combination of a shankA, having recess a', with shoulder d and boltfholes ct, a fiat blade B,having a convex cutting--edge b, terminating at the point b in a datsweep, and a partly concave and partly convex cutting-edge b, said outting edges joined by a wide top having straight edges 5 11joining eachother at.

an obtuse angle and provided with boltfholes- B B B, and t-he bolts O,connecting said shank and blade adj ustably, substantially as set forth.

2. A reversible colter having a convex cutting-edge b, terminating `by aflat sweep in a point b', and a concave cutting-edge b, saidcutting-edges joined by the point b', and a wide upper part having twostraight edges b 5, meeting at an obtuse angle and determining theposition of the blade on the shank, and said blade provided withboltholes B B B, substantially as set forth.`

In testimony whereof I have signed in the presence of the undersignedwitnesses.

LEVI WALKER.

Witnesses:

DONALD GEANT, JAMES RoBB.

IOO

